D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
92/2
D21H 21/14 (2006.01) D21F 11/00 (2006.01) D21F 11/14 (2006.01) D21H 17/36 (2006.01)
Patent
CA 1084317
TRANSFER AND ADHERENCE OF RELATIVELY DRY PAPER WEB TO A ROTATING CYLINDRICAL SURFACE Gregory A. Bates ABSTRACT OF THE DISCLOSURE In manufacturing a soft and absorbent tissue paper, a moist web deposited from a fiber-water slurry, is contoured with the pattern from an open mesh conveying fabric and thermally dried to a relatively high fiber consistency. Following these steps, the resulting relatively dry patterned web is imprinted as it is transferred and adhered to a rotating cylindrical surface in the form of a Yankee dryer utilizing an aqueous polyvinyl alcohol solution where the polyvinyl alcohol is characterized by a particular degree of hydrolysis and particular viscosity characteristics. By thermally drying to a high fiber consistency prior to the transfer step, the amount of drying load required to be carried by the Yankee dryer is reduced resulting in either (1) increased line speed as a result: of reduced Yankee drying load, which reduces the required residence time of the web on the dryer or (2) a reduction in the required diameter of the Yankee dryer, a significant reduction in capital equipment cost. By thermally drying the web to a relatively high consistency on the conveying fabric, a deeper more pronounced pattern in the Z direction is obtained due to an increase in web structure strength and resistance to compaction of the pattern. This results in increased bulk (lower density) and increased softness. As a result of utilizing the particular polyvinyl alcohol, transfer and adherence of the relatively dry web to the Yankee dryer is obtained so as to minimize the amount of skipped crepe whereby the problem of web breakage downstream of creping is eliminated.
222411
Bates Gregory A.
Gowling Lafleur Henderson Llp
The Procter & Gamble Company
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